# FRANK Solutions for Class 9 Maths Chapter 18 - Rectilinear Figures

Understand polygons with Frank Solutions for ICSE Class 9 Mathematics Chapter 18 Rectilinear Figures. Learn to use the correct theorems for calculating the sum of interior angles of a polygon or sum of exterior angles of a polygon. Also, practise how to calculate the measurement of each angle of a polygon with our chapter solutions.

Revising the Frank textbook solutions for ICSE Class 9 Maths can help you to brush up the concepts on how to find the number of sides of a given polygon. Further, if you have any doubts related to rectilinear figures, visit the ‘UnDoubt’ platform at TopperLearning for answers from experts.

## Chapter 18 - Rectilinear Figures Exercise Ex. 18.1

Is it possible to have a polygon whose sum of interior angles is 780°?

Is it possible to have a polygon whose sum of interior angles is 7 right angles?

Is it possible to have a polygon whose each interior angle is 124°?

Is it possible to have a polygon whose each interior angle is 105°?

A heptagon has three angles equal to 120°, and the other four angles are equal. Find all the angles.

In a polygon, there are 3 right angles and the remaining angles are equal to 165°. Find the number of sides in the polygon.

ABCDE is a pentagon in which AB is parallel to DC and Find angle A.

If
the difference between an exterior angle of a regular polygon of 'n' sides
and an exterior angle of another regular polygon of '(n + 1)' sides is equal
to 4^{o}; find the value of 'n'.

The number of sides of two regular polygons are in the ratio 2 : 3 and their interior angles are in the ratio 9 : 10. Find the number of sides of each polygon.

In a regular pentagon PQRST, PR = QT intersect at N. Find the angle RQT and QNP.

Each exterior angle of a regular polygon is times of its interior angle. Find the number of sides in the polygon.

Each interior angle of a regular polygon is 162°. Another regular polygon has number of sides double the first polygon. Find each interior angle of the second polygon.

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